<template>
  <div class="login-container">
    <el-form
      ref="loginForm"
      :model="loginForm"
      :rules="loginRules"
      class="login-form"
      auto-complete="on"
      label-position="left"
    >
      <!-- 登录页面标题 -->
      <!-- todo：可以考虑加入一两个图标 -->
      <div class="title-container">
        <h3 class="title">登录 表单</h3>
      </div>
      <!-- 用户名表单 -->
      <el-form-item prop="username">
        <span class="svg-container">
          <svg-icon icon-class="user"/>
        </span>
        <!-- palceholder为默认的表单元素
            name为表单提交时获得的数据存储的键
            type为输入框的类型
            tabindex
            -->
        <el-input
          ref="username"
          v-model="loginForm.username"
          placeholder="Username"
          name="username"
          type="text"
          tabindex="1"
          auto-complete="on"
        />
      </el-form-item>
      <!-- 密码表单 -->
      <el-form-item prop="password">
        <span class="svg-container">
          <svg-icon icon-class="password"/>
        </span>
        <el-input
          :key="passwordType"
          ref="password"
          v-model="loginForm.password"
          :type="passwordType"
          placeholder="Password"
          name="password"
          tabindex="2"
          auto-complete="on"
          @keyup.enter.native="handleLogin"
        />
        <span class="show-pwd" @click="showPwd">
          <svg-icon
            :icon-class="passwordType === 'password' ? 'eye' : 'eye-open'"
          />
        </span>
      </el-form-item>
      <el-col :span="2">
        <el-checkbox
          v-model="loginForm.rememberMe"
          style="margin: 0 0 25px 0; color: #fff"
        >
          记住我
        </el-checkbox>
      </el-col>
      <el-button
        :loading="loading"
        type="primary"
        style="width: 100%; margin-bottom: 30px"
        @click.native.prevent="handleLogin"
      >Login
      </el-button>
      <Vcode :show="isShow" @success="success" @close="close"/>
      <el-row :gutter="20">
        <el-col
          :lg="{span: 10, offset: 16}"
          :md="{span: 10, offset: 16}"
          :sm="{span: 12, offset: 16}"
          :xs="{span: 12, offset: 13}"
        >
          <div class="tips">
          <span style="margin-right: 20px">
              <el-link type="primary">
                <router-link to="/register">忘记密码</router-link>
              </el-link>
            </span>
            <span>
              <el-link type="primary">
                <router-link to="/register">注册账号</router-link>
              </el-link>
            </span>
          </div>
        </el-col>
      </el-row>
    </el-form>
  </div>
</template>

<script>
import { validUsername } from '@/utils/validate'
import Vcode from 'vue-puzzle-vcode'

export default {
  name: 'Login',
  components: {
    Vcode
  },
  data() {
    const validateUsername = (rule, value, callback) => {
      if (!validUsername(value)) {
        callback(new Error('Please enter the correct user name'))
      } else {
        callback()
      }
    }
    const validatePassword = (rule, value, callback) => {
      if (value.length < 1) {
        callback(new Error('The password can not be less than 6 digits'))
      } else {
        callback()
      }
    }
    return {
      loginForm: {
        username: 'admin',
        password: '123',
        rememberMe: true
      },
      isShow: false, // 验证码模态框是否出现
      loginRules: {
        username: [
          { required: true, trigger: 'blur', validator: validateUsername }
        ],
        password: [
          { required: true, trigger: 'blur', validator: validatePassword }
        ]
      },
      loading: false,
      passwordType: 'password',
      redirect: undefined
    }
  },
  watch: {
    $route: {
      handler: function(route) {
        this.redirect = route.query && route.query.redirect
      },
      immediate: true
    }
  },
  methods: {
    forgetPwd() {
      console.log('hello')
    },
    showPwd() {
      if (this.passwordType === 'password') {
        this.passwordType = ''
      } else {
        this.passwordType = 'password'
      }
      this.$nextTick(() => {
        this.$refs.password.focus() // 下一时刻聚焦
      })
    },
    handleLogin() {
      this.$refs.loginForm.validate((valid) => {
        if (valid) {
          this.isShow = true
        } else {
          console.log('error submit!!')
          return false
        }
        // 此处代码用于表单的验证，可以进行ajax请求验证
      })
    },
    // 用户通过了验证
    success(msg) {
      this.isShow = false // 通过验证后，需要手动隐藏模态框
      this.loading = true
      this.$store.dispatch('user/login', this.loginForm).then(() => {
        this.$router.push({ path: this.redirect || '/' })
        this.loading = false
      }).catch(() => {
        this.loading = false
      })
    },
    // 用户点击遮罩层，应该关闭模态框
    close() {
      this.isShow = false
    }
  }
}
</script>

<style lang="scss">
/* 修复input 背景不协调 和光标变色 */
/* Detail see https://github.com/PanJiaChen/vue-element-admin/pull/927 */

$bg: #283443;
$light_gray: #fff;
$cursor: #fff;

@supports (-webkit-mask: none) and (not (cater-color: $cursor)) {
  .login-container .el-input input {
    color: $cursor;
  }
}

/* reset element-ui css */
.login-container {
  .el-input {
    display: inline-block;
    height: 47px;
    width: 85%;

    input {
      background: transparent;
      border: 0px;
      -webkit-appearance: none;
      border-radius: 0px;
      padding: 12px 5px 12px 15px;
      color: $light_gray;
      height: 47px;
      caret-color: $cursor;

      &:-webkit-autofill {
        box-shadow: 0 0 0px 1000px $bg inset !important;
        -webkit-text-fill-color: $cursor !important;
      }
    }
  }

  .el-form-item {
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.1);
    border-radius: 5px;
    color: #454545;
  }
}
</style>

<style lang="scss" scoped>
$bg: #2d3a4b;
$dark_gray: #889aa4;
$light_gray: #eee;

.login-container {
  min-height: 100%;
  width: 100%;
  background-color: $bg;
  overflow: hidden;

  .login-form {
    position: relative;
    width: 520px;
    max-width: 100%;
    padding: 160px 35px 0;
    margin: 0 auto;
    overflow: hidden;
  }

  .tips {
    font-size: 14px;
    color: #fff;
    margin-bottom: 10px;

    span {
      &:first-of-type {
        margin-right: 16px;
      }
    }
  }

  .svg-container {
    padding: 6px 5px 6px 15px;
    color: $dark_gray;
    vertical-align: middle;
    width: 30px;
    display: inline-block;
  }

  .title-container {
    position: relative;

    .title {
      font-size: 26px;
      color: $light_gray;
      margin: 0px auto 40px auto;
      text-align: center;
      font-weight: bold;
    }
  }

  .show-pwd {
    position: absolute;
    right: 10px;
    top: 7px;
    font-size: 16px;
    color: $dark_gray;
    cursor: pointer;
    user-select: none;
  }
}
</style>
